US7177687B2 - Implantable cardiac stimulator wherein AV-delay adjustment is limited during dynamic atrial overdrive - Google Patents
Implantable cardiac stimulator wherein AV-delay adjustment is limited during dynamic atrial overdrive Download PDFInfo
- Publication number
- US7177687B2 US7177687B2 US10/272,850 US27285002A US7177687B2 US 7177687 B2 US7177687 B2 US 7177687B2 US 27285002 A US27285002 A US 27285002A US 7177687 B2 US7177687 B2 US 7177687B2
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- United States
- Prior art keywords
- delay
- rate
- shortening
- control circuit
- mode
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
- A61N1/3621—Heart stimulators for treating or preventing abnormally high heart rate
- A61N1/3622—Heart stimulators for treating or preventing abnormally high heart rate comprising two or more electrodes co-operating with different heart regions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
- A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
- A61N1/368—Heart stimulators controlled by a physiological parameter, e.g. heart potential comprising more than one electrode co-operating with different heart regions
- A61N1/3682—Heart stimulators controlled by a physiological parameter, e.g. heart potential comprising more than one electrode co-operating with different heart regions with a variable atrioventricular delay
Definitions
- the present invention relates to an implantable cardiac stimulating device of the type having the capability to adapt the AV-delay depending on different operating conditions of the cardiac stimulating device.
- AV-delay is used for AV sequential pacing and the term PV-delay is used for sensed P-waves followed by ventricular stimulations synchronized to the sensed P-wave.
- an algorithm for stimulation rate-correlated shortening of the AV/PV delay is used. While this is physiological during exercise and of benefit in DDD/VDD pacing at higher rates, the shortening is, as first understood by the inventor herein, less appropriate during periods of high stimulation rate at rest. This situation might occur during a situation referred to as atrial overdrive.
- Atrial overdrive is used to suppress spontaneous atrial activity in patients who suffer from paroxysmal atrial tachyarrhythmias.
- Atrial overdrive might be implemented as dynamic overdrive which means that the pulse generator normally provides a stimulation rate that is slightly above the underlying, possibly varying, intrinsic rate.
- overdrive pacing is described in U.S. Pat. No. 4,503,857, which discloses the concept of dynamic overdrive in order to achieve a high percentage of pacing at a rate only slightly higher than the underlying intrinsic rate.
- the algorithm disclosed in the two documents mentioned above for implementing dynamic overdrive is that if there has been an atrial inhibition the stimulation rate is increased with a predetermined step.
- This algorithm for increase of the stimulation rate is applied as long as there are atrial inhibitions.
- 100% pacing is achieved after increasing the stimulation rate in one or several steps the pacing rate is slowly decreased until an atrial inhibition is detected in which case the stimulation rate is increased again by a predetermined step as described above. If the patient has arrhythmic tendencies such as frequent PAC's (Premature Atrial Contraction) this may result in a stimulating rate that is significantly higher than the optimal physiologic rate.
- no inhibitions occur the pacemaker will stimulate at its base rate or lower rate. If the pacemaker is of the rate responsive type the pacemaker will operate at its sensor indicated rate. In the two last cases the pacemaker will overdrive the heart but it will not operate in dynamic overdrive.
- An object of the present invention is to provide automatic adjustment of the AV-delay under dynamic overdrive of the atrium.
- a cardiac pacemaker of the type described above wherein a control circuit adjusts the sensed and paced AV/PV delays to obtain physiologically optimal AV/PV delays at different paced and sensed heart rates, and wherein the control circuit operates the pacing circuitry to, under appropriate conditions, in a mode for dynamic overdrive of the atrium, and wherein the AV delay adjustment is limited if the device is in the dynamic atrial overdrive mode.
- the present invention thus is concerned with a cardiac pacemaker which provides an AV-interval which is optimized for the heart under all conditions including dynamic overdrive of the atrium for atrial tachyarrhythmia suppression.
- the inventor has, as noted above, found that shortening of the AV-interval during dynamic atrial overdrive may be unphysiological and that such shortening should be limited or avoided.
- the AV-delay used during dynamic overdrive is the base rate or lower rate AV delay.
- the lower rate or base rate is the stimulation rate used by the pacemaker when the stimulation rate is not affected by sensed P-waves or by a sensor for rate responsiveness.
- the AV-delay used during dynamic overdrive of the atria is the AV delay indicated by the sensor rate.
- the AV-delay used during dynamic overdrive is the AV-delay indicated by the underlying intrinsic rate.
- This embodiment is particularly useful in patients in which the underlying physiologic rate can be determined with a good accuracy.
- the underlying physiologic rate can be determined from sensed P-waves or from a physiologic sensor. This is particularly advantageous if the pulse generator is adapted to employ well known techniques to differentiate PAC's from P-waves originating from the sinus node. One way to accomplish this differentiation is morphology analysis of the P-wave. Only P-waves originating from the sinus node shall be employed for determination of the underlying physiologic rate.
- the AV-delay used during dynamic overdrive is determined from several input factors.
- these input factors may be the physiologic underlying intrinsic rate, the sensor indicated rate, the actual overdrive rate.
- the determination may employ averaging or other weighting of the input factors.
- FIG. 1 shows a typical cardiac pacemaker connected to a patient's heart via leads.
- FIG. 2 shows a typical electronics module for a cardiac pacemaker.
- FIG. 3 indicates how the AV delay is determined in a pacemaker according to the invention.
- FIG. 4 shows the resulting determined AV delay for different stimulation modes and stimulation rates.
- FIG. 5 shows one example of a flow chart for how the AV interval may be calculated.
- FIG. 1 shows a typical cardiac pacemaker 1 with a pacemaker electronics module 6 inside a hermetically sealed enclosure 2 .
- the cardiac leads 4 and 5 with attached electrodes 13 and 14 conduct stimulation pulses to the patient's heart 3 .
- Signals originating from P-waves and R-waves are picked up by electrodes 13 and 14 and conducted by the leads 4 and 5 to the pacemaker electronics module 6 which includes circuitry for detection of those signals.
- FIG. 2 shows a typical design of a pacemaker electronics module 6 .
- the electronics module 6 contains the following elements: micro-processor 9 , read-write memory 10 , control circuit 8 , rate responsive sensor 7 , atrial pace-sense circuit 12 and ventricular pace-sense circuit 11 .
- the rate responsive sensor may be either of a physiological type such as a respiration minute volume sensor or of an activity kind such as an accelerometer for measurement of body movements.
- the microprocessor 9 supervises the operation of the control circuit 8 through execution of code stored in the read-write memory 10 .
- application-specific algorithms such as control of the AV-interval's dependence on stimulation rate is defined as a software routine in the read-write memory 10 .
- FIG. 3 shows input data that may be used by the AV-delay routine to calculate the AV-delay.
- the stimulation mode are atrial overdrive, sensed and tracked P-waves, sensor controlled AV sequential stimulation.
- the AV-delay is calculated for each heart cycle dependent on stimulation rate and stimulation mode.
- FIG. 4 graphically shows examples of how the AV-delay can be varied dependent on stimulation mode.
- FIG. 5 shows a flowchart of the AV interval calculation.
- the assumption is that overdrive pacing is activated. First it is determined if overdrive pacing was active during at the last atrial event. If that was the case then provisional AV-delays are calculated according to different calculation rules.
- the first input data to be used would be the activity or physiologic sensor indicated rate for determination of an appropriate AV-delay.
- the second input data to be used would be the sensed P-wave rate for determination of the AV delay. This will require filtering and averaging since if atrial overdrive is active then only few P-waves will be sensed.
- the use of filtered and averaged P-wave rate is particularly suitable if the frequency of PAC's is relatively low since in this case the sensed P-wave rate will be physiologically correct. It should be noted, however, that the frequency of sensed atrial events will be less than one atrial event out of 20 so the adaption to changes in physical activity will be poor if sensed P-waves are used alone for AV interval determination.
- One method for filtering is to use the average interval of the last three sensed P-waves to determine the P-wave rate that will control the AV interval.
- the third input data to be used would be the actual overdrive rate. It should be noted that the AV interval shortening with increased overdrive will be lower than for sensed P-waves and that the shortening with increasing overdrive rate also may be zero. After having determined the AV interval according to those three criteria the shortest of the three calculated AV intervals are used.
- the AV interval shall be calculated in a normal manner depending on the paced or sensed heart rate.
- the resulting AV interval is written to the control circuit to make the AV interval applicable during the ongoing heart cycle.
- the actually used AV interval during overdrive may be based on only the sensor indicated rate or the AV interval may be determined as a blend from the sensor indicated rate, the sensed and filtered P-wave rate and the actual overdrive rate.
- One embodiment that may be advantageous for certain patients is to use the base rate AV interval always when atrial pacing pulses are delivered regardless of rate.
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- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Electrotherapy Devices (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0104296A SE0104296D0 (sv) | 2001-12-18 | 2001-12-18 | Pacemaker |
SE0104296-9 | 2001-12-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20030114890A1 US20030114890A1 (en) | 2003-06-19 |
US7177687B2 true US7177687B2 (en) | 2007-02-13 |
Family
ID=20286396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/272,850 Expired - Fee Related US7177687B2 (en) | 2001-12-18 | 2002-10-16 | Implantable cardiac stimulator wherein AV-delay adjustment is limited during dynamic atrial overdrive |
Country Status (4)
Country | Link |
---|---|
US (1) | US7177687B2 (xx) |
EP (1) | EP1321167B1 (xx) |
DE (1) | DE60208612T2 (xx) |
SE (1) | SE0104296D0 (xx) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060047320A1 (en) * | 2003-12-22 | 2006-03-02 | Cardiac Pacemakers, Inc. | Method and system for delivering cardiac resynchronization therapy with variable atrio-ventricular delay |
US20060235481A1 (en) * | 2005-04-19 | 2006-10-19 | Cardiac Pacemakers, Inc. | Selective resynchronization therapy optimization based on user preference |
US20070150013A1 (en) * | 2003-12-22 | 2007-06-28 | Cardiac Pacemakers, Inc.. | Method and system for setting cardiac resynchronization therapy parameters |
US20220408856A1 (en) * | 2019-09-26 | 2022-12-29 | Toray Industries, Inc. | Garment |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0607938D0 (en) | 2006-04-21 | 2006-05-31 | Imp College Innovations Ltd | An apparatus and a method for programming a pacemaker |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4503857A (en) | 1981-10-26 | 1985-03-12 | Vitatron Medical B.V. | Programmable cardiac pacemaker with microprocessor control of pacer rate |
US4554921A (en) * | 1983-02-11 | 1985-11-26 | Vitafin N.V. | Dual chamber pacemaker with automatic high rate limit mode determination |
US4856524A (en) | 1988-08-29 | 1989-08-15 | Intermedics, Inc. | A-V responsive rate adaptive pacemaker |
EP0450487A1 (de) | 1990-03-31 | 1991-10-09 | Hoechst Aktiengesellschaft | Benzoxazinderivate, Verfahren zu ihrer Herstellung und ihre Verwendung zum Behandeln oder zur Prophylaxe von Krankheiten |
US5330511A (en) | 1993-01-19 | 1994-07-19 | Vitatron Medical B.V. | Dual chamber pacemaker with automatically optimized AV delay |
US6058328A (en) | 1996-08-06 | 2000-05-02 | Pacesetter, Inc. | Implantable stimulation device having means for operating in a preemptive pacing mode to prevent tachyarrhythmias and method thereof |
US6081747A (en) | 1998-11-23 | 2000-06-27 | Pacesetter, Inc. | Dual-chamber implantable pacemaker having negative AV/PV hysteresis and ectopic discrimination |
EP1110580A2 (en) | 1999-12-23 | 2001-06-27 | Pacesetter, Inc. | Methods and apparatus for overdrive pacing heart tissue using an implantable cardiac stimulation device |
-
2001
- 2001-12-18 SE SE0104296A patent/SE0104296D0/xx unknown
-
2002
- 2002-08-28 DE DE60208612T patent/DE60208612T2/de not_active Expired - Lifetime
- 2002-08-28 EP EP02019066A patent/EP1321167B1/en not_active Expired - Lifetime
- 2002-10-16 US US10/272,850 patent/US7177687B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4503857A (en) | 1981-10-26 | 1985-03-12 | Vitatron Medical B.V. | Programmable cardiac pacemaker with microprocessor control of pacer rate |
US4554921A (en) * | 1983-02-11 | 1985-11-26 | Vitafin N.V. | Dual chamber pacemaker with automatic high rate limit mode determination |
US4856524A (en) | 1988-08-29 | 1989-08-15 | Intermedics, Inc. | A-V responsive rate adaptive pacemaker |
EP0450487A1 (de) | 1990-03-31 | 1991-10-09 | Hoechst Aktiengesellschaft | Benzoxazinderivate, Verfahren zu ihrer Herstellung und ihre Verwendung zum Behandeln oder zur Prophylaxe von Krankheiten |
US5330511A (en) | 1993-01-19 | 1994-07-19 | Vitatron Medical B.V. | Dual chamber pacemaker with automatically optimized AV delay |
EP0607951A2 (en) | 1993-01-19 | 1994-07-27 | Vitatron Medical B.V. | Dual chamber pacemaker with automatically optimized AV delay |
US6058328A (en) | 1996-08-06 | 2000-05-02 | Pacesetter, Inc. | Implantable stimulation device having means for operating in a preemptive pacing mode to prevent tachyarrhythmias and method thereof |
US6081747A (en) | 1998-11-23 | 2000-06-27 | Pacesetter, Inc. | Dual-chamber implantable pacemaker having negative AV/PV hysteresis and ectopic discrimination |
EP1110580A2 (en) | 1999-12-23 | 2001-06-27 | Pacesetter, Inc. | Methods and apparatus for overdrive pacing heart tissue using an implantable cardiac stimulation device |
Non-Patent Citations (1)
Title |
---|
"Use of Flywheel, Automatic Underdrive and Dynamic Overdrive in Atrial Pacers," Barnay et al., "Cardiac Pacemakers: Diagnostic Options, Dual Chamber Pacing, Rate Responsive Pacing, Antitachycardia Pacing," (1985) pp. 238-247. |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8121685B2 (en) | 2003-12-22 | 2012-02-21 | Cardiac Pacemakers, Inc. | Method and system for delivering cardiac resynchronization therapy with variable atrio-ventricular delay |
US20060047320A1 (en) * | 2003-12-22 | 2006-03-02 | Cardiac Pacemakers, Inc. | Method and system for delivering cardiac resynchronization therapy with variable atrio-ventricular delay |
US20070150013A1 (en) * | 2003-12-22 | 2007-06-28 | Cardiac Pacemakers, Inc.. | Method and system for setting cardiac resynchronization therapy parameters |
US8731660B2 (en) | 2003-12-22 | 2014-05-20 | Cardiac Pacemakers, Inc. | Method and system for setting cardiac resynchronization therapy parameters |
US20110106202A1 (en) * | 2003-12-22 | 2011-05-05 | Jiang Ding | Method and system for setting cardiac resynchronization therapy parameters |
US20100069988A1 (en) * | 2003-12-22 | 2010-03-18 | Jiang Ding | Method and system for delivering cardiac resynchronization therapy with variable atrio-ventricular delay |
US8626289B2 (en) | 2003-12-22 | 2014-01-07 | Cardiac Pacemakers, Inc. | Method and system for delivering cardiac resynchronization therapy with variable atrio-ventricular delay |
US7869873B2 (en) | 2003-12-22 | 2011-01-11 | Cardiac Pacemakers, Inc. | Method and system for setting cardiac resynchronization therapy parameters |
US8483827B2 (en) | 2003-12-22 | 2013-07-09 | Cardiac Pacemakers, Inc. | Method and system for delivering cardiac resynchronization therapy with variable atrio-ventricular delay |
US20100010557A1 (en) * | 2005-04-19 | 2010-01-14 | Richard Fogoros | Selective resynchronization therapy optimization based on user preference |
US8041426B2 (en) | 2005-04-19 | 2011-10-18 | Cardiac Pacemakers, Inc. | Selective resynchronization therapy optimization based on user preference |
US20060235481A1 (en) * | 2005-04-19 | 2006-10-19 | Cardiac Pacemakers, Inc. | Selective resynchronization therapy optimization based on user preference |
US7613514B2 (en) | 2005-04-19 | 2009-11-03 | Cardiac Pacemakers, Inc. | Selective resynchronization therapy optimization based on user preference |
US20220408856A1 (en) * | 2019-09-26 | 2022-12-29 | Toray Industries, Inc. | Garment |
Also Published As
Publication number | Publication date |
---|---|
SE0104296D0 (sv) | 2001-12-18 |
DE60208612T2 (de) | 2006-08-10 |
US20030114890A1 (en) | 2003-06-19 |
EP1321167B1 (en) | 2006-01-11 |
EP1321167A2 (en) | 2003-06-25 |
EP1321167A3 (en) | 2003-11-19 |
DE60208612D1 (de) | 2006-04-06 |
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AS | Assignment |
Owner name: ST. JUDE MEDICAL AB, SWEDEN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHULLER, HANS;REEL/FRAME:013409/0785 Effective date: 20021008 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20110213 |